Chris@909: module CollectiveIdea #:nodoc:
Chris@909:   module Acts #:nodoc:
Chris@909:     module NestedSet #:nodoc:
Chris@909:       # This module provides some helpers for the model classes using acts_as_nested_set.
Chris@909:       # It is included by default in all views.
Chris@909:       #
Chris@909:       module Helper
Chris@909:         # Returns options for select.
Chris@909:         # You can exclude some items from the tree.
Chris@909:         # You can pass a block receiving an item and returning the string displayed in the select.
Chris@909:         #
Chris@909:         # == Params
Chris@909:         #  * +class_or_item+ - Class name or top level times
Chris@909:         #  * +mover+ - The item that is being move, used to exlude impossible moves
Chris@909:         #  * +&block+ - a block that will be used to display: { |item| ... item.name }
Chris@909:         #
Chris@909:         # == Usage
Chris@909:         #
Chris@909:         #   <%= f.select :parent_id, nested_set_options(Category, @category) {|i|
Chris@909:         #       "#{'–' * i.level} #{i.name}"
Chris@909:         #     }) %>
Chris@909:         #
Chris@909:         def nested_set_options(class_or_item, mover = nil)
Chris@909:           class_or_item = class_or_item.roots if class_or_item.is_a?(Class)
Chris@909:           items = Array(class_or_item)
Chris@909:           result = []
Chris@909:           items.each do |root|
Chris@909:             result += root.self_and_descendants.map do |i|
Chris@909:               if mover.nil? || mover.new_record? || mover.move_possible?(i)
Chris@909:                 [yield(i), i.id]
Chris@909:               end
Chris@909:             end.compact
Chris@909:           end
Chris@909:           result
Chris@909:         end  
Chris@909:         
Chris@909:       end
Chris@909:     end  
Chris@909:   end
Chris@909: end